Plant Structures
Plant cell structures, organelles, and specialized plant tissues including vacuoles, plastids, cell walls, and transport mechanisms.
Questions
The central vacuole of the plant cell performs all of the following functions, except
- controlling movement of molecules between the cytosol and sap
- storing useful material
- digesting waste proteins
- excreting unwanted materials
The middle lamella of the plant cell wall is rich in
- glycoproteins
- hemicellulose
- pectin
- microfibrils
Non-flagellated sperms are found in
- conifers
- pteridophytes
- cycads
- ginkgo
Which of the following structures is/are formed during late cytokineses and serve(s) as a scaffold for plant cell assembly?
- Plasmodesmata
- Phragmoplast
- Phragmosome
- Microfilaments
In plant cells, the synthesis of palmitic acid takes place in
- chromoplasts
- leucoplasts
- mitochondria
- vacuoles
Gerontoplasts are a type of plastids. They are involved in
- pigment synthesis and storage
- dismantling of the photosynthetic apparatus
- protein modification
- detecting gravity
Besides carrying out photosynthesis, plastids also function in
- synthesising fatty acids
- synthesis of plasma membrane
- cell division
- excretion of unused substrates
In moss sporophyte, leptomes perform the function of
- xylem
- phloem
- cuticle
- trichomes
Brefeldin A is a lactone antibiotic produced by fungal organisms such as Eupenicillium brefeldianum. It is used to check the activity of which of the following cell organelles?
- Mitochondria
- Nucleus
- Golgi apparatus
- Endoplasmic reticulum
Which of the following pairs of organelles is not present in sieve tube elements?
- Cell wall and nuclei
- Mitochondria and nuclear membrane
- Nuclei and ribosomes
- Golgi bodies and vacuoles
The space outside the plasma membrane of a plant cell, within which material can diffuse freely, is
- tonoplast
- symplast
- apoplast
- elaioplast
Which of the following cells of plants are specialised in nectar secretion?
- Chlorenchyma
- Sclerenchyma
- Collenchyma
- Parenchyma
Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algae. They are the centers of CO2 fixation. They are found in which of the following algae?
- Prymnesium parvum
- Cyanophora paradoxa
- Chlamydomonas reinhardtii
- Rhodogorgon ramosissima
The space resulting from separation of cell walls from each other, as the cells grow older by partial dissolution of inter-cellular substance, is called
- lysigenous intercellular space
- schizogenous intercellular space
- gap junction
- phragmosome
Which of the following statements about sclereids is false?
- They have highly thickened lignified walls.
- They are always isodiametric in shape.
- Cores of apples are due to sclereids.
- They protect other cells.